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/*******************************************************************************
* Copyright (c) 2006 Oracle Corporation.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Cameron Bateman/Oracle - initial API and implementation
*
********************************************************************************/
package org.eclipse.jst.jsf.common.util;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.jdt.core.IType;
import org.eclipse.jdt.core.ITypeHierarchy;
import org.eclipse.jdt.core.JavaModelException;
import org.eclipse.jdt.core.Signature;
import org.eclipse.jst.jsf.common.JSFCommonPlugin;
/**
* Utility for handling IType's and type signatures
*
* @author cbateman
*
*/
public final class TypeUtil
{
static IType resolveType(final IType owningType, final String typeSignature)
{
// if type signature is already resolved then simply look it up
if (typeSignature.charAt(0) == Signature.C_RESOLVED
|| (Signature.getTypeSignatureKind(typeSignature) == Signature.ARRAY_TYPE_SIGNATURE
&& Signature.getElementType(typeSignature).charAt(0) == Signature.C_RESOLVED))
{
IType type = null;
try
{
type = owningType.getJavaProject().
findType(getFullyQualifiedName(typeSignature));
}
catch (JavaModelException jme)
{
// do nothing; return type == null;
}
return type;
}
return resolveTypeRelative(owningType, typeSignature);
}
/**
* @param owningType
* @param typeSignature
* @return the resolved type signature for typeSignature in owningType
*/
public static String resolveTypeSignature(final IType owningType, final String typeSignature)
{
final int sigKind = Signature.getTypeSignatureKind(typeSignature);
switch (sigKind)
{
case Signature.BASE_TYPE_SIGNATURE:
return typeSignature;
case Signature.ARRAY_TYPE_SIGNATURE:
{
final String elementType = Signature.getElementType(typeSignature);
if (Signature.getTypeSignatureKind(elementType) == Signature.BASE_TYPE_SIGNATURE)
{
return typeSignature;
}
final String resolvedElementType = resolveSignatureRelative(owningType, elementType);
String resultType = ""; //$NON-NLS-1$
for (int i = 0; i < Signature.getArrayCount(typeSignature);i++)
{
resultType+=Signature.C_ARRAY;
}
return resultType+resolvedElementType;
}
case Signature.CLASS_TYPE_SIGNATURE:
return resolveSignatureRelative(owningType, typeSignature);
default:
return typeSignature;
}
}
/**
* @param owningType -- type relative to which typeSignature will be resolved
* @param typeSignature -- non-array type signature
* @return the resolved type signature if possible or typeSignature if not
*/
private static String resolveSignatureRelative(final IType owningType, final String typeSignature)
{
String adjustedTypeSignature = typeSignature;
// if already fully resolved, return the input
if (adjustedTypeSignature.charAt(0) == Signature.C_RESOLVED)
{
return typeSignature;
}
IType resolvedType = resolveTypeRelative(owningType, adjustedTypeSignature);
if (resolvedType != null)
{
String resolvedTypeSignature =
Signature.createTypeSignature
(resolvedType.getFullyQualifiedName(), true);
return resolvedTypeSignature;
}
if (Signature.getTypeSignatureKind(typeSignature) ==
Signature.CLASS_TYPE_SIGNATURE)
{
// TODO: is there a better way to handle a failure to resolve
// than just garbage out?
JSFCommonPlugin.log(new Exception("Failed to resolve type: "+typeSignature), "Failed to resolve type: "+typeSignature); //$NON-NLS-1$ //$NON-NLS-2$
}
return typeSignature;
}
private static IType resolveTypeRelative(final IType owningType, final String typeSignature)
{
final String fullName = getFullyQualifiedName(typeSignature);
IType resolvedType = null;
try
{
String[][] resolved = owningType.resolveType(fullName);
if (resolved != null && resolved.length > 0)
{
resolvedType = owningType.getJavaProject().findType(resolved[0][0], resolved[0][1]);
}
else
{
resolvedType = resolveInParents(owningType, fullName);
}
}
catch (JavaModelException jme)
{
// do nothing; newType == null
}
return resolvedType;
}
/**
* @param type
* @return a type signature for a type
*/
public static String getSignature(IType type)
{
final String fullyQualifiedName = type.getFullyQualifiedName();
return Signature.createTypeSignature(fullyQualifiedName, true);
}
/**
* @param owner
* @param unresolvedSignature
* @return the resolved method signature for unresolvedSignature in owner
*/
public static String resolveMethodSignature(final IType owner,
final String unresolvedSignature)
{
// get the list of parameters
final String[] parameters =
Signature.getParameterTypes(unresolvedSignature);
for (int i = 0; i < parameters.length; i++)
{
// try to full resolve the type
parameters[i] = resolveTypeSignature(owner, parameters[i]);
}
// resolve return type
final String resolvedReturn =
resolveTypeSignature(owner,
Signature.getReturnType(unresolvedSignature));
return Signature.createMethodSignature(parameters, resolvedReturn);
}
/**
* @param typeSignature * @return a fully qualified Java class name from a type signature
* i.e. Ljava.lang.String; -> java.lang.String
* @return the fully qualifed classname
*/
public static String getFullyQualifiedName(final String typeSignature)
{
final String packageName = Signature.getSignatureQualifier(typeSignature);
final String typeName = Signature.getSignatureSimpleName(typeSignature);
return "".equals(packageName) ? typeName : packageName + "." + typeName; //$NON-NLS-1$//$NON-NLS-2$
}
private static IType resolveInParents(IType childType, String fullyQualifiedName)
throws JavaModelException
{
IType resolvedType = null;
// not resolved? try the supertypes
final ITypeHierarchy typeHierarchy =
childType.newSupertypeHierarchy(new NullProgressMonitor());
IType[] superTypes = typeHierarchy.getAllSupertypes(childType);
String[][] resolved;
LOOP_UNTIL_FIRST_MATCH:
for (int i = 0; i < superTypes.length; i++)
{
IType type = superTypes[i];
resolved = type.resolveType(fullyQualifiedName);
if (resolved != null && resolved.length > 0)
{
resolvedType = childType.getJavaProject().findType(resolved[0][0], resolved[0][1]);
break LOOP_UNTIL_FIRST_MATCH;
}
}
return resolvedType;
}
}
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